Retirement Plans - Schedule of Fair Value of Plan Assets for Pension Plans with a PBO or ABO in Excess of Plan Assets (Details) - Pension Plans [Member] - USD ($) $ in Millions |
May 31, 2018 |
May 31, 2017 |
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U.S. Plans [Member] | |||||
Defined Benefit Plan Disclosure [Line Items] | |||||
Fair value of plan assets | $ 22,057 | $ 24,933 | |||
PBO | (22,653) | (27,870) | |||
Net funded status | (596) | (2,937) | |||
ABO | [1] | (1,134) | (27,244) | ||
Fair value of plan assets | 859 | 24,933 | |||
PBO | (1,214) | (27,870) | |||
Net funded status | (355) | (2,937) | |||
International Plans [Member] | |||||
Defined Benefit Plan Disclosure [Line Items] | |||||
Fair value of plan assets | 1,060 | 952 | |||
PBO | (1,791) | (1,656) | |||
Net funded status | (731) | (704) | |||
ABO | [1] | (1,581) | (1,433) | ||
Fair value of plan assets | 1,060 | 928 | |||
PBO | (1,791) | (1,626) | |||
Net funded status | $ (731) | $ (698) | |||
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